In reply to andy16:
> (In reply to Matt250)
>
> No one really uses doubles in Squam.
Isn't that because North Americans don't know how to use doubles, not because doubles are a bad idea?
To the OP: I've not not been to Squamish yet, but I'd probably take a pair of half ropes and a 60 metre single rope between me and my partner.
I don't think it will matter what length your half ropes are in Squamish and I'd just take the pair I had already. But if I was buying new ropes I'd probably go with 50m as I think 60m ropes are overkill for the vast majority of UK rock climbing.
I'd also get 8.5mm ropes as they will last a lot longer than skinny 8mm ropes, don't stretch as much and are less likely to get chopped on a sharp edge.
Mammut Genesis, Beal Cobra 2s and DMM Prophets are all excellent ropes for trad climbing.
HTH